Shaft-coupling



UNITED STATES PATENT OFFICE.

DAVID Bo'oRMANoF ALTooNA, PENNSYLVANIA.

Y SHAFT-CgouPLlNc.

SPECIFICATION forming part of Iietters Pat-ent No. 503,033, dated August 8, 1893.

- Apnlication filed Merch 25, 1893,. ,SerialNm 467,570. (No model.)

To all whom it may concern,.-

Altoona, in the county of Blair and State of Pennsylvania, have invented certain new and useful lmprovementsin Shaft-Couplin gs; and ,f I do hereby declare the following to be a full, f

clear, and exact description of the invention, suc'h as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improvement ened, loosened or uncoupled, and is designedY more particularly as an improvement on my Patent No.432,364c, granted me July 15, 1890.,

My invention consists in certain novel features of construction and combinations of parts as will be hereinafter more fully de-l scribed and pointed out in the claims.

In the accompanying drawings Figure l is a view in longitudinal section through the coupling collar and two of the keys, the ends of the shafts appearing in elevation. Fig. 2 is a view in transverse section through the shaft showing the coupling and keys in end elevation. Fig. 3 is a View in perspective of one of the keys. Fig. 4 is a View in side elevation of a modified form of collar showing the internal formation in dotted lines. Fig. 5 is a view in end elevation of this modified form of collar, and Fig. 6 is a modified form of collar.

A and B represent a pair of shafts, the ends of which are provided witha series of keyseats b. Thev depth of the latter decreases gradually as they extend toward the ends of the shafts thus giving them a tapering form, as shown.

C isa collar, the center of which is bored to receive the ends of shafts A, B, and is provided r with a series of key-seats a extending straight i to project beyond the juncture of the shafts Be 1t known that I, DAvID BooRMAN, of'

A, B, whereby the Ylonger key locks the ends of both shafts. v

The keys D, D', are preferably of the form shown in Fig. 3, each of which is'provided with a horizontal bolt 'hole adapted to receive and accommodate the bolt E,'by means of which the keys D,D,are tightened or loosened as desired.

Theends of the collar are preferably iianged so that the ends of the'keys and bolts together with the nuts are protected. When the parts are assembled, the nuts on bolts E are screwed home and the shafts are thus securely held together and prevented from turning.

The bottom or inclined faces of keys D,D, are made to conform to the shape of the taperin g key-seats b of shafts A, B, and when the former are tightened by the bolts E, it will readily be seen that the keys D, D', will travel toward each other and securely lock the shafts against movement and also lock the keys against endwise movement. When the keys are constructed in one piece it sometimes happens that the pressure on both shafts is not equal and consequently one shaft is liable to have slight play, but by constructing the keys as above described,this difficulty is obviated. By turningV the nut on bolt E it will be seen that Athe keys D, D travel up the oppositely inclined faces of the key-seats b toward each other and consequently firmly lock the shafts A, B, together.

I might in some instances use keys of the same length instead of making them of unequal lengths as shown, and I can alsoif desired dispense with key-seats on the shafts and form tapering key-seats in the collar as clearly shown in Fig. 5. With this latter construction, it will not be necessary where the shaftshave but light work to perform to form seats of any kind in the shafts, but it is evident, if I so desire, that I can simply atten the surfaces of the shafts against which the keys rest and then positively overcome any tendency of either section to turn. Again if I. so desire 1 can as shown in Fig. 6 provide one or both sections of each key with female threads with which a bolt Vpassing. through a clamp can be screwed when it is necessary to withdraw the sections for uncoupling.

IOO

It is evident that changes in the construction and relative arrangement of the several parts mightl be lnade without avoiding,r my invention and hence I would have it understood that I do not restrict myself to the particular construction and arrangement of parts shown and described, but,

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. In a shaft coupling, the combination with a pair of shafts the adjacent ends of which each have key-seats formed therein, of a collar having key-seats therein, and a series of keys made to conform to the shape of the openings formed by the key-seats in the shafts and collar, and means for locking the keys passing through every two keys for holding the shafts against displacement, substantially as set forth.

2. In a shaft coupling, the combination with a pair of shafts having key-seats formed therein, of a collar having key'seats therein, and a series of keys having bolt holes therein said keys made to conform to the shape of the openings formed by the key-seats in the shafts and collar, and a bolt adapted to be passed through the holes in each pair of keys, whereby the lat ter are drawn toward each other, substantiall y as set forth.

3. In a shaft coupling.,r the combination with a pair of shafts the ends of which are provided with inclining key seats, of a collar in which the ends of the shaft are placed, keys tted in each of the seats and means passing through every two keys for drawing the keys toward each other, substantially as set forth.

4. In a shaft coupling, the combination with a pair of shafts, and a collar, said parts each provided with key seats, of keys of unequal lengths, located in the seats, the longer keys overlapping the ends of both shafts, and bolts passed through the keys whereby they are drawn toward each other, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two subscribing Witnesses.

DAVID BOORMAN.

Witnesses:

W. D. CoUoH, C. B. SHAY. 

